You can install PI OPC DA Server enables the functionality you are looking. Similar to other OPC servers, OPC client can connect and request data from PI.
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What you are looking for is AFDataPipe class. If you are unfamiliar with how they work and how to implement them, I would strongly suggest taking a look at More about Data Pipes first. It is part of our "Developing Applications with PI AF SDK" course that is available on the Learn section of PI Square.
Beat me to it!
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This online learning course teaches an introduction to PIDataPipe:
And there are lots of blogs and postings here from a simple PI Square search:
Suggest use "datapipe" or "data pipe" to catch any reference to PI or AF
A good blog on the topic: